Researchers used Claude to hack OpenAI employees' ChatGPT accounts

Summary by Cyber Security News18 Sep 2026, 19:16 CEST

About this summary. This is a short, independently written summary of an article first published by The Register. Cyber Security News did not report or verify the underlying story. Read the original: https://www.theregister.com/security/2026/09/18/researchers-used-claude-to-hack-openai-employees-chatgpt-accounts/5297517

Talk about your competitor getting through the door. Security researchers used Anthropic's Claude to help hack into OpenAI employees’ ChatGPT accounts. A trio of bug hunters researching frontier AI labs’ security weaknesses chained two vulnerabilities to take over multiple OpenAI employees’ ChatGPT accounts, then used that access to demonstrate they could reach an internal OpenAI repository by opening a harmless pull request.

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